At the time of writing (2013-03-16) one version can be purchased through DealExtreme SKU 169625

The firmware developer has said the UART is accessible on the PCB, but he doesn't know where. The purpose of J10 is unknown but does not appear to be a serial port.

Serial console / bootloader access

There does not appear to be any way of accessing a serial port on the PCB, despite the kernel sending output to the SoC's serial port.

The bootloader is U-Boot 1.1, and it appears to be set to boot over TFTP from 192.168.1.23 within five seconds after power on (according to the U-Boot environment variables in /dev/mtdblock1), although obviously this doesn't happen. The device does not emit any ARP queries or other network traffic until the Linux kernel has loaded.

dmesg

This was obtained from the stock firmware by uploading a fully featured busybox binary and using it to run dmesg.